Go to the PODCASTER tab of your podcast page on Listen Notes (Example), and click on the "Claim this podcast" button:
If the email associated with your account matches the email in the RSS feed, then you can claim the page successfully.
Otherwise, you can try one of these methods to prove that you own the podcast:
Change your email to the one in the RSS feed in Settings (you need to log in first), then come back and claim again.
If you actually own the email address in the RSS feed, then send us an email from that email address.
Add the word Listen Notes in the description of your podcast in the RSS feed. Then send us an email.
Email us screenshots of the dashboard of your podcast hosting service.